/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#define LOG_TAG "SensorBase"
#include <fcntl.h>
#include <errno.h>
#include <math.h>
#include <poll.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/select.h>
#include <stdlib.h>
#include <cutils/log.h>

#include <linux/input.h>

#include "SensorBase.h"

SensorBase::SensorBase(const char* dev_name, const char* data_name)
    : dev_name(dev_name), data_name(data_name),
    dev_fd(-1),
    data_fd(-1)
{
    if (data_name) {
        data_fd = openInput(data_name);
    }
}

SensorBase::~SensorBase() {
    if (data_fd >= 0) {
        close(data_fd);
    }

    if (dev_fd >= 0) {
        close(dev_fd);
    }
}

int SensorBase::open_device() {
    if (dev_fd < 0 && dev_name) {
        dev_fd = open(dev_name, O_RDONLY);
        ALOGE_IF(dev_fd<0, "Couldn't open %s (%s)", dev_name, strerror(errno));
    }

    return 0;
}

int SensorBase::close_device() {
    if (dev_fd >= 0) {
        close(dev_fd);
        dev_fd = -1;
    }

    return 0;
}

int SensorBase::getFd() const
{
    if (!data_name) {
        return dev_fd;
    }

    return data_fd;
}

int SensorBase::setEnable(int32_t handle, int enabled) {
    return 0;
}
int SensorBase::getEnable(int32_t handle) {
    return 0;
}

int SensorBase::setDelay(int32_t handle, int64_t ns) {
    return 0;
}

bool SensorBase::hasPendingEvents() const {
    return false;
}

void  processEvent(int code, int value) {

}

int64_t SensorBase::getTimestamp() {
    struct timespec t;

    t.tv_sec = t.tv_nsec = 0;
    clock_gettime(CLOCK_MONOTONIC, &t);

    return int64_t(t.tv_sec)*1000000000LL + t.tv_nsec;
}

int SensorBase::set_sysfs_input_attr(char *class_path,const char *attr, char *value, int len)
{
    char path[256];
    int fd;

    if (class_path == NULL || *class_path == '\0'
        || attr == NULL || value == NULL || len < 1) {
        return -EINVAL;
    }

    snprintf(path, sizeof(path), "%s/%s", class_path, attr);
    path[sizeof(path) - 1] = '\0';
    fd = open(path, O_RDWR);

    if (fd < 0) {
        ALOGD("Could not open (write-only) SysFs attribute \"%s\" (%s).", attr, strerror(errno));
        close(fd);
        return -errno;
    }

    if (write(fd, value, len) < 0) {
        ALOGD("path:%s", path);
        ALOGD("Could not write SysFs attribute \"%s\" (%s).", attr, strerror(errno));
        close(fd);
        return -errno;
    }

    close(fd);

    return 0;
}

int SensorBase::openInput(const char* inputName) {
    int fd = -1;
    int input_id = -1;
    const char *dirname = "/dev/input";
    const char *inputsysfs = "/sys/class/input";
    char devname[PATH_MAX];
    char *filename;
    DIR *dir;
    struct dirent *de;

    dir = opendir(dirname);
    if(dir == NULL)
        return -1;

    strcpy(devname, dirname);
    filename = devname + strlen(devname);
    *filename++ = '/';

    while((de = readdir(dir))) {
        if(de->d_name[0] == '.' &&
           (de->d_name[1] == '\0' ||
            (de->d_name[1] == '.' && de->d_name[2] == '\0')))
            continue;

        strcpy(filename, de->d_name);
        fd = open(devname, O_RDONLY);

        if (fd>=0) {
            char name[80];

            if (ioctl(fd, EVIOCGNAME(sizeof(name) - 1), &name) < 1) {
                name[0] = '\0';
            }
            //
            //                        ALOGD("name is %s \n", name);
            //		        ALOGD("inputName is %s \n", inputName);
            if (!strcmp(name, inputName)) {

                break;
            } else {
                close(fd);
                fd = -1;
            }
        }
    }

    closedir(dir);
#ifdef DEBUG_IF
    ALOGE_IF(fd<0, "couldn't find '%s' input device", inputName);
#endif

    return fd;
}
int SensorBase::readEvents(sensors_event_t* data, int count) {
    return 0;
}

